Iron ore crushing process. Very low grade iron ore in large lumps is firstly sized through crushing process. The common crushing machines used in iron ore beneficiation plant are jaw crusher as primary crusher, cone crusher or fine jaw crusher as secondary crusher. The iron ore materials of required size after screening then pass to the.The process of ore dressing is carried out to remove the silicious materials. It is the process of separating commercially valuable minerals from their ores. It is also called mineral engineering, mineral processing, or mineral dressing.